<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .box {
      width: 500px;
      height: 500px;
      margin: 100px auto;
    }

    .box img {
      width: 100%;
      transition: all .5s;
    }

    .box:hover img {
      /* width: 150%; */

      transform: scale(1.2);
      transform: scale(.8);
    }
  </style>
</head>

<body>
  <div class="box">
    <img src="./风景图.jpg" alt="">
  </div>
</body>

</html>